Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size M64 Inside Diameter 66 mm Outside Diameter 115 mm Maximum Thickness 9 mm System of Measurement Metric Minimum Thickness 9 mm Color Clear Inside Diameter Tolerance 2.598-2.628 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C